A Multicenter Trial to Evaluate the Efficacy, Safety, Tolerability and Pharmacokinetics of HZN-825 in Patients With Diffuse Cutaneous Systemic Sclerosis

Study Purpose

This is a randomized, double-blind, placebo-controlled, repeat-dose, multicenter trial. Participants will be screened within 6 weeks prior to the Baseline (Day 1) Visit. Approximately 300 participants who meet the trial eligibility criteria will be randomized on Day 1 in a 1:1:1 ratio to receive HZN-825 300 mg QD, HZN-825 300 mg BID or placebo for 52 weeks. The trial will include up to a 42-day Screening Period and a 52-week Double-blind Treatment Period. Participants will take their first dose of trial drug at the clinic and will participate in trial visits at Week 4 and every 6 weeks thereafter until Week 52. All participants who complete the Double-blind Treatment Period (Week 52) will be eligible to enter a 52-week extension trial (HZNP-HZN-825-302, NCT05626751). Participants not entering the extension trial will participate in a Safety Follow-up Visit 4 weeks after the last dose of trial drug.

Recruitment Criteria

Accepts Healthy Volunteers Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms	No
Study Type An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes. An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes. Searching Both is inclusive of interventional and observational studies.	Interventional
Eligible Ages	18 Years - 75 Years
Gender	All

More Inclusion & Exclusion Criteria

Inclusion Criteria:

1. Written informed consent. 2. Male or female between the ages of 18 and 75 years, inclusive, at Screening. 3. Meets the 2013 American College of Rheumatology/European League Against Rheumatism classification criteria for SSc with a total score of ≥9 (Van den Hoogen et al., 2013). 4. Classified as having skin involvement proximal to the elbow and knee (diffuse cutaneous SSc subset by LeRoy and Medsger, 2001). 5. At the time of enrollment, less than or equal to 72 months (6 years) since the onset of the first SSc manifestation, other than Raynaud's phenomenon. 6. Skin thickening from SSc in the forearm suitable for repeat biopsy. 7. mRSS units ≥15 at Screening. 8. FVC ≥45% predicted at Screening, as determined by spirometry. 9. Willing and able to comply with the prescribed treatment protocol and evaluations for the duration of the trial.

Exclusion Criteria:

1. Positive for anti-centromere antibodies with the exception that subjects who are positive for both anti-centromere and anti-topoisomerase 1 antibodies may be enrolled. 2. Diagnosed with sine scleroderma or limited cutaneous SSc. 3. Diagnosed with other autoimmune connective tissue diseases, except for fibromyalgia, scleroderma-associated myopathy and secondary Sjogren's syndrome. 4. Scleroderma renal crisis diagnosed within 6 months of the Screening Visit. 5. Any of the following cardiovascular diseases: 1. uncontrolled, severe hypertension (≥160/100 mmHg) or persistent low blood pressure (systolic blood pressure <90 mmHg) within 6 months of Screening, 2. myocardial infarction within 6 months of Screening, 3. unstable cardiac angina within 6 months of Screening. 6. DLCO <40% predicted (corrected for hemoglobin). If severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) exposure is of clinical concern for any subject, consider using a DLCO up to 6 months before the Screening Visit. 7. Pulmonary arterial hypertension (PAH) by right heart catheterization requiring treatment with more than 1 oral PAH-approved therapy or any parenteral therapy. Treatment is allowed for erectile dysfunction and/or Raynaud's phenomenon/digital ulcers. 8. Corticosteroid use for conditions other than SSc within 4 weeks prior to Screening (topical steroids for dermatological conditions and inhaled/intranasal/intra-articular steroids are allowed). 9. Use of any other non-steroid immunosuppressive agent, small biologic molecule, cytotoxic or anti-fibrotic drug within 4 weeks of Screening, including cyclophosphamide, azathioprine (Imuran®) or other immunosuppressive or cytotoxic medication. Exceptions include mycophenolate mofetil (CellCept®), mycophenolic acid (Myfortic®), methotrexate and low-dose prednisone, as follows: use of CellCept ≤3 g/day, Myfortic ≤2.14 g/day, methotrexate ≤20 mg/week and prednisone ≤10 mg/day (or equivalent dosing of glucocorticoids) is allowed. Subjects taking CellCept, Myfortic or methotrexate must have been doing so for ≥6 months and the dose must have been stable for ≥4 weeks prior to the Day 1 Visit. Prednisone must have been at a stable dose for ≥8 weeks prior to the Day 1 Visit. It is acceptable to be on background low-dose prednisone and anti-malarial drug along with CellCept, Myfortic or methotrexate. Rituximab must not have been used within 6 months of the Day 1 Visit. 10. Known active bacterial, viral, fungal, mycobacterial or other infection, including tuberculosis or atypical mycobacterial disease (fungal infections of nail beds are allowed) at the time of randomization. 11. Use of a United States Food and Drug Administration-approved agent for SSc or an investigational agent for any condition within 90 days or 5 half-lives, whichever is longer, prior to Screening or anticipated use during the course of the trial. 12. Malignant condition in the past 5 years (except successfully treated basal/squamous cell carcinoma of the skin or cervical cancer in situ). 13. Women of childbearing potential or male subjects not agreeing to use highly effective method(s) of birth control throughout the trial and for 1 month after last dose of trial drug. Male subjects must refrain from sperm donation and females from egg/ova donation for this same time period. 14. Pregnant or lactating women. 15. Current drug or alcohol abuse or history of either within the previous 2 years, in the opinion of the Investigator or as reported by the subject. 16. Previous enrollment in this trial or participation in a prior HZN-825 or SAR100842 clinical trial. 17. Known history of positive test for human immunodeficiency virus (HIV). HIV testing is optional based on Investigator assessment, institutional practices or local guidelines to rule out suspected HIV or potential for a positive HIV result. Subject consent is required prior to HIV testing. 18. Active hepatitis (hepatitis B: positive hepatitis B surface antigen and positive anti-hepatitis B core antibody [anti-HBcAb] and negative hepatitis B surface antibody [HBsAb] or positive for HBcAb with a positive test for HBsAb and with presence of hepatitis B virus DNA at Screening; hepatitis C: positive anti-hepatitis C virus [anti-HCV] and positive RNA HCV). 19. Current alcoholic liver disease, primary biliary cirrhosis or primary sclerosing cholangitis. 20. Previous organ transplant (including allogeneic and autologous marrow transplant). 21. International normalized ratio >2, prolonged prothrombin time >1.5 × the upper limit of normal (ULN) or partial thromboplastin time >1.5 × ULN at Screening. 22. Alanine aminotransferase or aspartate aminotransferase >2 × ULN. 23. Estimated glomerular filtration rate <30 mL/min/1.73 m^2 at Screening. 24. Total bilirubin >2 × ULN. Subjects with documented diagnosis of Gilbert's syndrome may be enrolled if their total bilirubin is ≤3.0 mg/dL. 25. Any other condition that, in the opinion of the Investigator, would preclude enrollment in the trial.

Trial Details

Trial ID: This trial id was obtained from ClinicalTrials.gov, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.	NCT04781543
Phase Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans. Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data. Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs. Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.	Phase 2
Lead Sponsor The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.	Horizon Therapeutics Ireland DAC
Principal Investigator The person who is responsible for the scientific and technical direction of the entire clinical study.	Medical Director
Principal Investigator Affiliation	Horizon Therapeutics
Agency Class Category of organization(s) involved as sponsor (and collaborator) supporting the trial.	Industry
Overall Status	Recruiting
Countries	Argentina, Austria, Chile, France, Germany, Greece, Israel, Italy, Japan, Korea, Republic of, Mexico, Netherlands, Poland, Portugal, Romania, Spain, Switzerland, United Kingdom, United States
Conditions The disease, disorder, syndrome, illness, or injury that is being studied.	Diffuse Cutaneous Systemic Sclerosis, Sclerosis, Systemic

Arms & Interventions

Arms

Experimental: HZN-825 300 mg once daily (QD)

One set of 2 HZN-825 150mg tablets in the morning and one set of 2 placebo tablets in the evening.

Experimental: HZN-825 300 mg twice daily (BID)

One set of 2 HZN-825 150mg tablets in the morning and one set of 2 HZN-825 150mg tablets in the evening.

Placebo Comparator: Placebo

One set of 2 placebo tablets in the morning and one set of 2 placebo tablets in the evening.

Interventions

Drug: - HZN-825 BID

300 mg oral tablets BID

Drug: - Placebo

Placebo BID

Drug: - HZN-825 QD

300 mg oral tablets QD

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

Phoenix, Arizona

Status

Recruiting

Address

Arizona Arthritis and Rheumatology Research, PLLC

Phoenix, Arizona, 85032

Site Contact

Mandee Lochridge

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